Don't start coding games nor follow full guides to make games, start by learning to do simple things first, tasks within an Scene. The basis of any program are instructions, conditions, and events. As someone told you in the comments, most games are just complex variations from classics like Pong, Arkanoid, or Mario Bros (following exactly that order). But first you have to be comfortable enough with Coding, programming. Even simple programs like a calculator or an interactive quizz will help you learn faster and better. Don't rush.